Speed has been intermittent for quite some time. Pull the xducer and clean paddle wheel but no joy. Sort of starts working whenever. Last trip is did not work at all over 150 miles. Just happened to check temp the other day and it is out too.

Just wondering if xducers fail very often? It is a sealed unit and intuitively looks like it should last forever, what's to break other than the paddle wheel which is spinning along just fine. I realize this is naive but just sayin, the unit is about 4 years old.

Also interested in commentary here. My speed works intermittently, but my experience has been that it needs to be pulled and cleaned weekly to keep it functioning due to algae growth. Also typically reads 1-2kts lower than GPS, even if sailing against currents when I'd expect it to read higher.